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Debt (Schedule Of General Information Of Financing Transaction) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |
Secured financing |  | $ 5,361,500,000 | $ 3,990,900,000 |
Restricted cash and cash equivalents |  | 501,300,000 | 457,700,000 | $ 410,000,000.0
Senior notes |  | $ 991,300,000 | 989,000,000.0 |
Revolving Secured Line Of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary |  | n/a |  |
Debt maturity date |  | Jun. 22, 2027 |  |
Financing Amount |  | $ 390,000,000.0 |  |
Revolving Secured Line Of Credit [Member] | Prime Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 87.50% |  |
Revolving Secured Line Of Credit [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 197.50% |  |
RTP Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary |  | n/a |  |
Financing Amount | [1] | $ 20,000,000.0 |  |
Warehouse Facility II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding LLC II |  |
Debt maturity date | [2],[3] | Sep. 20, 2027 |  |
Debt financing amount | [2] | $ 500,000,000.0 |  |
Secured financing |  | 0 | 0 |
Loans pledged as collateral |  | 0 | 0 |
Restricted cash and cash equivalents |  | $ 2,500,000 | $ 1,000,000.0 |
Interest rate |  | 0.00% | 0.00% |
Warehouse Facility II [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 185.00% |  |
Warehouse Facility IV [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding LLC IV |  |
Debt maturity date | [2],[3] | Dec. 29, 2026 |  |
Debt financing amount | [2] | $ 300,000,000.0 |  |
Secured financing |  |  | $ 0 |
Loans pledged as collateral |  | 0 | 0 |
Restricted cash and cash equivalents |  | $ 0 | $ 1,500,000 |
Interest rate |  | 0.00% | 0.00% |
Warehouse Facility IV [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 221.40% |  |
Warehouse Facility V [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding LLC V |  |
Debt maturity date | [2],[4] | Dec. 29, 2027 |  |
Debt financing amount | [2] | $ 250,000,000.0 |  |
Secured financing |  | 0 |  |
Loans pledged as collateral |  | 0 | $ 0 |
Restricted cash and cash equivalents |  | $ 1,000,000.0 | $ 1,000,000.0 |
Interest rate |  | 0.00% | 0.00% |
Warehouse Facility V [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 185.00% |  |
Warehouse Facility VI [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding LLC VI |  |
Debt maturity date | [2],[3] | Sep. 30, 2026 |  |
Debt financing amount | [2] | $ 75,000,000.0 |  |
Secured financing |  | 0 | $ 0 |
Loans pledged as collateral |  | 0 | 0 |
Restricted cash and cash equivalents |  | $ 0 | $ 0 |
Interest rate |  | 0.00% | 0.00% |
Warehouse Facility VI [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 210.00% |  |
Warehouse Facility VIII [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | CAC Warehouse Funding LLC VIII |  |
Debt maturity date | [2],[3] | Sep. 21, 2026 |  |
Debt financing amount | [2] | $ 200,000,000.0 |  |
Secured financing |  | 0 | $ 0 |
Loans pledged as collateral |  | 0 | 0 |
Restricted cash and cash equivalents |  | $ 0 | $ 800,000 |
Interest rate |  | 0.00% | 0.00% |
Warehouse Facility VIII [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 225.00% |  |
Term ABS 2019-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2019-2 |  |
Debt maturity date | [2],[5] | Sep. 15, 2026 |  |
Debt financing amount | [2] | $ 500,000,000.0 |  |
Secured financing |  | 500,000,000.0 | $ 500,000,000.0 |
Loans pledged as collateral |  | 529,000,000.0 | 597,300,000 |
Restricted cash and cash equivalents |  | $ 41,700,000 | $ 47,600,000 |
Interest rate |  | 5.43% | 5.15% |
Term ABS 2021-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2021-1 |  |
Debt maturity date | [2],[5] | Feb. 17, 2026 |  |
Debt financing amount | [2] | $ 100,000,000.0 |  |
Secured financing |  | 100,000,000.0 | $ 100,000,000.0 |
Loans pledged as collateral |  | 112,000,000.0 | 112,800,000 |
Restricted cash and cash equivalents |  | $ 8,700,000 | $ 8,800,000 |
Interest rate |  | 6.60% | 7.56% |
Term ABS 2021-1 [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 220.00% |  |
Term ABS 2021-4 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2021-4 |  |
Debt maturity date | [2],[3] | Oct. 16, 2023 |  |
Debt financing amount | [2] | $ 250,100,000 |  |
Secured financing |  | 63,600,000 | $ 221,600,000 |
Loans pledged as collateral |  | 167,000,000.0 | 255,200,000 |
Restricted cash and cash equivalents |  | $ 16,400,000 | $ 21,000,000.0 |
Interest rate |  | 1.89% | 1.46% |
Term ABS 2022-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2022-1 |  |
Debt maturity date | [2],[3] | Jun. 17, 2024 |  |
Debt financing amount | [2] | $ 350,000,000.0 |  |
Secured financing |  | 236,600,000 | $ 350,000,000.0 |
Loans pledged as collateral |  | 310,000,000.0 | 378,200,000 |
Restricted cash and cash equivalents |  | $ 24,900,000 | $ 27,400,000 |
Interest rate |  | 5.24% | 5.03% |
Term ABS 2022-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2022-2 |  |
Debt maturity date | [2],[5] | Jun. 15, 2027 |  |
Debt financing amount | [2] | $ 300,000,000.0 |  |
Secured financing |  | 300,000,000.0 | $ 200,000,000.0 |
Loans pledged as collateral |  | 406,000,000.0 | 212,100,000 |
Restricted cash and cash equivalents |  | $ 25,200,000 | $ 14,700,000 |
Interest rate |  | 7.29% | 7.66% |
Term ABS 2022-2 [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 246.40% |  |
Term ABS 2022-3 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2022-3 |  |
Debt maturity date | [2],[3] | Oct. 15, 2024 |  |
Debt financing amount | [2] | $ 389,900,000 |  |
Secured financing |  | 347,600,000 | $ 389,900,000 |
Loans pledged as collateral |  | 395,200,000 | 418,900,000 |
Restricted cash and cash equivalents |  | $ 29,100,000 | $ 28,900,000 |
Interest rate |  | 7.82% | 7.68% |
Term ABS 2023-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2023-1 |  |
Debt maturity date | [2],[3] | Mar. 17, 2025 |  |
Debt financing amount | [2] | $ 400,000,000.0 |  |
Secured financing |  | 400,000,000.0 | $ 400,000,000.0 |
Loans pledged as collateral |  | 453,000,000.0 | 611,600,000 |
Restricted cash and cash equivalents |  | $ 33,100,000 | $ 38,500,000 |
Interest rate |  | 6.92% | 6.92% |
Term ABS 2023-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2023-2 |  |
Debt maturity date | [2],[3] | May 15, 2025 |  |
Debt financing amount | [2] | $ 400,000,000.0 |  |
Secured financing |  | 400,000,000.0 | $ 400,000,000.0 |
Loans pledged as collateral |  | 533,300,000 | 701,700,000 |
Restricted cash and cash equivalents |  | $ 36,800,000 | $ 42,000,000.0 |
Interest rate |  | 6.39% | 6.39% |
Term ABS 2023-3 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2023-3 |  |
Debt maturity date | [2],[3] | Aug. 15, 2025 |  |
Debt financing amount | [2] | $ 400,000,000.0 |  |
Secured financing |  | 400,000,000.0 | $ 400,000,000.0 |
Loans pledged as collateral |  | 524,900,000 | 643,800,000 |
Restricted cash and cash equivalents |  | $ 36,500,000 | $ 40,300,000 |
Interest rate |  | 6.86% | 6.86% |
Term ABS 2023-A [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2023-A |  |
Debt maturity date | [2],[5] | Dec. 15, 2025 |  |
Debt financing amount | [2] | $ 200,000,000.0 |  |
Secured financing |  | 200,000,000.0 | $ 200,000,000.0 |
Loans pledged as collateral |  | 252,000,000.0 | 273,400,000 |
Restricted cash and cash equivalents |  | $ 17,700,000 | $ 17,200,000 |
Interest rate |  | 7.51% | 7.51% |
Term ABS 2023-5 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2023-5 |  |
Debt maturity date | [2],[3] | Dec. 15, 2025 |  |
Debt financing amount | [2] | $ 294,000,000.0 |  |
Secured financing |  | 294,000,000.0 | $ 294,000,000.0 |
Loans pledged as collateral |  | 398,700,000 | 433,900,000 |
Restricted cash and cash equivalents |  | $ 32,900,000 | $ 52,200,000 |
Interest rate |  | 6.54% | 6.54% |
Term ABS 2024-A [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2024-A |  |
Debt maturity date | [2],[5] | Feb. 15, 2027 |  |
Debt financing amount | [2] | $ 200,000,000.0 |  |
Secured financing |  | 200,000,000.0 |  |
Loans pledged as collateral |  | 248,400,000 | $ 0 |
Restricted cash and cash equivalents |  | $ 18,100,000 |  |
Interest rate |  | 7.45% |  |
Term ABS 2024-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2024-1 |  |
Debt maturity date | [2],[3] | Mar. 16, 2026 |  |
Debt financing amount | [2] | $ 500,000,000.0 |  |
Secured financing |  | 500,000,000.0 |  |
Loans pledged as collateral |  | 553,300,000 | 0 |
Restricted cash and cash equivalents |  | $ 45,000,000.0 |  |
Interest rate |  | 6.01% |  |
Term ABS 2024-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2024-2 |  |
Debt maturity date | [2],[3] | Jun. 15, 2026 |  |
Debt financing amount | [2] | $ 550,000,000.0 |  |
Secured financing |  | 550,000,000.0 |  |
Loans pledged as collateral |  | 646,800,000 | 0 |
Restricted cash and cash equivalents |  | $ 42,000,000.0 |  |
Interest rate |  | 6.21% |  |
Term ABS 2024-3 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2024-3 |  |
Debt maturity date | [2],[3] | Sep. 15, 2026 |  |
Debt financing amount | [2] | $ 600,000,000.0 |  |
Secured financing |  | 600,000,000.0 |  |
Loans pledged as collateral |  | 700,900,000 | 0 |
Restricted cash and cash equivalents |  | $ 51,500,000 |  |
Interest rate |  | 4.91% |  |
Term ABS 2024-B [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary | [2] | Credit Acceptance Funding LLC 2024-B |  |
Debt maturity date | [2],[5] | Dec. 15, 2027 |  |
Debt financing amount | [2] | $ 300,000,000.0 |  |
Secured financing |  | 300,000,000.0 |  |
Loans pledged as collateral |  | 425,800,000 | $ 0 |
Restricted cash and cash equivalents |  | $ 37,900,000 |  |
Interest rate |  | 6.13% |  |
2026 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary |  | n/a |  |
Debt maturity date |  | Mar. 15, 2026 |  |
Debt financing amount |  | $ 400,000,000.0 |  |
Interest rate |  | 6.625% | 6.625% |
Senior notes |  | $ 400,000,000.0 | $ 400,000,000.0 |
2028 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Wholly-owned Subsidiary |  | n/a |  |
Debt maturity date |  | Dec. 15, 2028 |  |
Debt financing amount |  | $ 600,000,000.0 |  |
Interest rate |  | 9.25% | 9.25% |
Senior notes |  | $ 600,000,000.0 | $ 600,000,000.0 |
[1] | Borrowings are subject to repayment on demand.
[2] | Financing made available only to a specified subsidiary of the Company.
[3] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date based on the cash flows of the pledged assets.
[4] | Represents the revolving maturity date. The outstanding balance will amortize after the revolving maturity date and any amounts remaining on December 27, 2029 will be due on that date.
[5] | Represents the revolving maturity date. The Company has the option to redeem and retire the indebtedness after the revolving maturity date. If we do not elect this option, the outstanding balance will amortize based on the cash flows of the pledged assets.

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